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- 저자 : 이금배(Kumbae Lee) (검색결과 5 건)
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홍정아(Jeong-Ah Hong),이금배(Kumbae Lee),전용두(Yong-Du Jun) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
A new baffle configuration, an annular baffles, are considered in the present study as an alternative to reduce the excessive pressure drop associated with the conventional segmental ones in typical operating conditions. Featuring with accelerated co-axial flow with periodic mixing by alternate baffles, conditions with better relative performance than the conventional ones could be identified through the present numerical experiments. The heat transfer and pressure drops are numerically simulated for a single tube shell-and-tube model and compared against the conventional-baffle cases with the no-baffle system as a reference. Baffle blockage and the flow rates are considered for the present study specifying a fixed baffle spacing. According to the present numerical study results, it is found that the heat transfer increases 1.4~2.2 times without significant pressure loss compared to the bare tube cases.
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강태식(Taesik Gang),장진욱(Jinwook Chang),이금배(Kumbae Lee) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
In this paper, we analyze the blower motor of a car noise, depending on the noise analysis, and try to find the problem. It confirmed the problem area by order analysis. Also it found the correct frequency through the frequency analysis. Noise from the test bench was same with the vehicle noise. It was confirmed that this is the same pattern to the vibration frequency analysis. Using this algorithm will utilize testing equipment after this.
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홍정아(Jeong-Ah Hong),전용두(Yong-Du Jun),이금배(Kumbae Lee) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.8
A new baffle configuration, an annular baffles, are considered in the present study as an alternative to reduce the excessive pressure drop associated with the conventional segmental ones in typical operating conditions. The heat transfer and pressure drops are numerically simulated for a single tube shell-and-tube model and compared against the conventional-baffle cases. Baffle blockage ratio and number of baffles are considered as the major variables for the present study specifying a fixed baffle spacing. It is found that the heat transfer increases 1.4∼2.2 times without significant pressure loss compared to the bare tube cases and the goodness factor increases 1.35 times compared to the conventional-baffle model.
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이금배,최응소 公州大學校工科大學生産技術硏究所 1996 論文集 Vol.4 No.-
Low thermal conductivity is a primary limitation in the development of advanced heat transfer fluids that are required in many industrial applications. However, it is well known that at room temperature, metals in solid form have orders-of-magnitude larger thermal conductivities than those of fluids. Therefore, the thermal conductivities of fluids that contain suspended solid metallic particles are expected to be significantly enhanced relative to those of conventional heat transfer fluids. In fact, the effective thermal conductivity of dispersions that contain solid particles has been studied theoretically and experimentally for more than 100 years. However, all of the studies dealing with the thermal conductivity of suspensions have been confined to millimeter-or micrometer-sized particles. Modern nanotechnology provides great opportunities to process and produce so-called nanoparticles with average sizes of about 10mm. Therefore, an innovative new class of energy-efficient heat transfer fluids can be engineered by suspending metallic nanoparticles in conventional heat transfer fluids. The resulting "nanofluids" are expected to exhibit much higher thermal conductivities than those of current heat transfer fluids. One of the most promising projects at Argonne is the development of these nanofluids as the world's most advanced heat transfer fluids. Nanofluids can be designed for optimal use in specific applications. One such applications is in the next generation of cooling systems. Argonne thermal scientists have developed the advanced technology to cool crystal silicon mirrors used in high-intensity X-ray sources such as Argonne's Advanced Photon Source. Because the X-ray beam creates tremendous heat as it strikes the mirror, cooling rates of 2000-3000 W/㎠ must be achievable. The advanced cooling process employs microhannels filled with nanofluids, thus providing more efficient cooling than any existing approach because the microchannels increase the effective heat transfer area and the metallic nanoparticles increase the coolant's effective thermal conductivity. This advanced nanofluid cooling technology may be used in engines, superconducting magnets, and densely packed computer chips. It may also be useful in fiber forming processes or in reducing the size of current industrial cooling equipment. The invention and development of nanofluids presents exciting new challenges and opportunities for thermal scientists and engineers.
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